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Plagiarism errors:
This is copy and paste errors. Some users copied an article from the net and edit it, paraphrase it and post it here to impress and have credit to their work. But ironically, that is unknown to them there is a fact finding software call plagiarism software and the experts in the forum use it to find out the copied work. Some users did this unknowingly while some did it unaware. Unaware in the sense that, they know that there is plagiarism rule in the forum so what they do is to paraphrase the article and post it here but the experts still detect it.
Plagiarism should not be considered as a mistake or error. Except in certain cases where it is proven that the poster or writer honestly forgets to acknowledge the source which is obvious that there is no way he or she was claiming ownership by way of not changing or altering the work copied as we have seen some members that have proved to have forgotten to paste source along with the post and hoping to come back to the post. For someone that has gone through formal education and presented project work or written thesis would have come across plagiarism as what is suppose to be credited. Not just on the forum but taking glory for another's labour isn't all that nice so not to be seen as mistake or error and when the words are largely changed, it may be proven as plagiarism.
Plagiarism cannot be a mistake or an error for someone who is aware of it. Because that moment you are lifting what is not yours, your conscience will let you know.
Plagiarism can only be considered as a error or mistake when newbies who think that here is like other social media they will copy and paste anything and go their ways. You can also notice some members from different local boards that does not understand English. They will manage to put together sentence that is difficult to understand. Do you think that such people know about plagiarism in their own countries? That is why everyone should try and put plagiarism rules of this forum in different boards.